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Special Items - Impairment Charge (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Special Items - Impairment Charge (Details) $ in Thousands	Sep. 30, 2021 USD ($) aircraft	Sep. 30, 2021 USD ($) aircraft	Jun. 30, 2023 aircraft
Impairment charges \| $	$ 84,592	$ 84,592
E175
Number of aircraft under purchase agreement		39
CRJ 900
Impairment charges \| $		$ 84,600
Sky West Airlines Inc \| CRJ 900 \| Forecast
Number of aircraft to be replaced			16
Sky West Airlines Inc \| Delta Capacity Purchase Agreement \| E175
Number of aircraft under purchase agreement	16
Sky West Airlines Inc \| Delta Capacity Purchase Agreement \| CRJ 900
Number of aircraft under purchase agreement	4